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GPT带我学-设计模式13-策略模式

news 2025/7/7 19:43:56

概述

策略模式

例子

你可以创建一个策略工厂（Strategy Factory）来根据传入的 orgId 动态地选择合适的策略。以下是实现示例：

首先，定义策略接口和具体策略类：

public interface CardPathStrategy {String generatePath();
}public class OrganizationAStrategy implements CardPathStrategy {@Overridepublic String generatePath() {return "path/for/organizationA";}
}public class OrganizationBStrategy implements CardPathStrategy {@Overridepublic String generatePath() {return "path/for/organizationB";}
}

创建一个策略工厂 CardPathStrategyFactory 来根据 orgId 返回相应的策略：

import java.util.HashMap;
import java.util.Map;public class CardPathStrategyFactory {private static final Map<String, CardPathStrategy> strategies = new HashMap<>();static {strategies.put("orgA", new OrganizationAStrategy());strategies.put("orgB", new OrganizationBStrategy());// 添加更多策略}public static CardPathStrategy getStrategy(String orgId) {return strategies.get(orgId);}
}

在你的业务逻辑中使用策略工厂：

public class CardPathGenerator {public static void main(String[] args) {String orgId = "orgA";  // 这个可以是传入的参数CardPathStrategy strategy = CardPathStrategyFactory.getStrategy(orgId);if (strategy == null) {throw new IllegalArgumentException("No strategy found for orgId: " + orgId);}CardPathContext context = new CardPathContext(strategy);System.out.println(context.generateCardPath());  // 输出：path/for/organizationAorgId = "orgB";  // 更改组织IDstrategy = CardPathStrategyFactory.getStrategy(orgId);if (strategy == null) {throw new IllegalArgumentException("No strategy found for orgId: " + orgId);}context.setStrategy(strategy);System.out.println(context.generateCardPath());  // 输出：path/for/organizationB}
}